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57b08b0944
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
68 lines
2.4 KiB
CMake
68 lines
2.4 KiB
CMake
#
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#//===----------------------------------------------------------------------===//
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#//
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#// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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#// See https://llvm.org/LICENSE.txt for license information.
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#// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#//
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#//===----------------------------------------------------------------------===//
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#
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# Checking a linker flag to build a shared library
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# There is no real trivial way to do this in CMake, so we implement it here
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# this will have ${boolean} = TRUE if the flag succeeds, otherwise FALSE.
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function(libomp_check_linker_flag flag boolean)
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if(NOT DEFINED "${boolean}")
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set(retval TRUE)
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set(library_source
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"int foo(int a) { return a*a; }")
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set(cmake_source
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"cmake_minimum_required(VERSION 2.8)
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project(foo C)
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set(CMAKE_SHARED_LINKER_FLAGS \"${flag}\")
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add_library(foo SHARED src_to_link.c)")
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set(failed_regexes "[Ee]rror;[Uu]nknown;[Ss]kipping;LINK : warning")
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set(base_dir ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/link_flag_check_${boolean})
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file(MAKE_DIRECTORY ${base_dir})
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file(MAKE_DIRECTORY ${base_dir}/build)
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file(WRITE ${base_dir}/src_to_link.c "${library_source}")
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file(WRITE ${base_dir}/CMakeLists.txt "${cmake_source}")
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message(STATUS "Performing Test ${boolean}")
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try_compile(
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try_compile_result
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${base_dir}/build
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${base_dir}
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foo
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OUTPUT_VARIABLE OUTPUT)
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if(try_compile_result)
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foreach(regex IN LISTS failed_regexes)
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if("${OUTPUT}" MATCHES ${regex})
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set(retval FALSE)
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endif()
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endforeach()
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else()
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set(retval FALSE)
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endif()
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if(${retval})
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set(${boolean} 1 CACHE INTERNAL "Test ${boolean}")
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message(STATUS "Performing Test ${boolean} - Success")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Performing C Linker Flag test ${boolean} succeeded with the following output:\n"
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"${OUTPUT}\n"
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"Source file was:\n${library_source}\n")
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else()
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set(${boolean} "" CACHE INTERNAL "Test ${boolean}")
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message(STATUS "Performing Test ${boolean} - Failed")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Performing C Linker Flag test ${boolean} failed with the following output:\n"
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"${OUTPUT}\n"
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"Source file was:\n${library_source}\n")
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endif()
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set(${boolean} ${retval} PARENT_SCOPE)
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endif()
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endfunction()
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